热轧工艺对高铝铁素体耐热不锈钢组织性能的影响

电站锅炉的连接件需具有优良的抗高温氧化性、冲击韧性和塑性，主要采用铁素体耐热不锈钢0.1C-18Cr-1Al-1Si制造，热轧工艺对其塑韧性能有至关重要的影响。采用热轧试验，研究了不同热轧工艺对铁素体耐热不锈钢0.1C-18Cr-1Al-1Si组织性能的影响规律。结果表明，热轧温度为700 ℃时，0.1C-18Cr-1Al-1Si热轧板的再结晶最充分；横纵轧和纵轧不同轧制方式下0.1C-18Cr-1Al-1Si板材小角度晶界比例均较高，边部小角度晶界出现频率更高；采用横纵轧工艺可以明显减轻0.1C-18Cr-1Al-1Si板材力学性能的各向异性。

Effect of hot rolling process on microstructure and properties of ferritic heat-resistant stainless steel with high aluminum content

The connection parts of power station boilers need to have excellent high temperature oxidation resistance,impact toughness and plasticity,which are mainly manufactured by ferritic heat resistant stainless steel 0.1C-18Cr-1Al-1Si plate.Its plasticity and toughess are mainy affected by hot rolling praess.Through hot rolling test,the effects of different hot rolling processes on the microstructure and properties of ferritic heat-resistant stainless steel 0.1C-18Cr-1Al-1Si were studied.The results show that the recrystallization of 0.1C-18Cr-1Al-1Si plate is the most sufficient at hot rolling temperature of 700 ℃.The proportions of small angle grain boundaries of 0.1C-18Cr-1Al-1Si plate are higher under cross-longitudinal rolling and longitudinal rolling modes,and the frequency of small angle grain boundaries at edges is higher.The anisotropy of mechanical properties of 0.1C-18Cr-1Al-1Si hot rolled plate can be significantly reduced by cross-longitudinal rolling.